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Shear Wave Velocity Structure beneath Maitri station in Dronning Maud Land, East Antarctica from Joint Inversions of Rayleigh Wave Ellipticity, Multimode Surface Waves and Diffused Wave Horizontal-to-Vertical Spectral Ratios.

Sivaram K, Shekar M, Saha S.

POLAR SCIENCE

https://doi.org/10.1016/j.polar.2025.101208 

This study analyzes Rayleigh Wave Ellipticity (RWE) and HVSR using ambient noise data (2013–2017) from Maitri station in Dronning Maud Land, East Antarctica, to assess shallow crustal shear velocity. Stable peaks near ~0.03 Hz and ~6 Hz indicate deep velocity contrasts and shallow variations. Joint inversion with surface-wave dispersion and a reference receiver function model reveals a low-velocity sedimentary layer (150–800 m), a densified layer (~3 km), and a strong velocity contrast at 30–35 km depth, likely the Moho.

(a) Crustal shear velocity structure from Rayleigh wave ellipticity (RWE) of ambient noise field (ANF) data using HV Time-frequency analysis (HVTFA), and theoretical dispersion curves of Rayleigh and Love waves up to 2nd higher modes using Dinver inversion module (in red).

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